"Our US team has arrived in North Korea to make arrangements for the Summit between Kim Jong Un and myself " he tweeted Xinhua reported.
The Trump-Kim meeting is scheduled to be held in Singapore on June 12.
"I truly believe North Korea has brilliant potential and will be a great economic and financial Nation one day. Kim Jong Un agrees with me on this. It will happen!" said the White House host.
The Washington Post reported earlier on Sunday that former US Ambassador to South Korea Sung Kim on Sunday crossed into North Korea to prepare for a summit with Choe Son Hui.
The Washington Post quoted State Department spokesperson Heather Nauert as saying that the meetings are expected to continue Monday and Tuesday in the northern part of the demilitarized zone where Kim Jong Un met with South Korean President Moon Jae-in on Saturday.
--IANS ahm/